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They/It/She
Their one true meaning in life was to posess people that got stuck in their backrooms level, but instead of fulfilling that prophecy, she somehow noclipped out of the backrooms, ending up in an abandoned fairgrounds along with a bunch of other people they've never met, somehow ending up in a cult.
She has no mouth, but can communicate via thoughts. They project their thoughts into other's minds so that she can be heard.